关键词: 代理签密, 基于身份的密码, 前向安全, 双线性对, 签密

Abstract: Based on an identity based signcryption scheme proposed by Chen and Malone-Lee，an identity based proxy-signcryption scheme from pairings is proposed in this paper.The new scheme not only has the function of proxy signature scheme，but also has the advantage of identity based signcryption scheme.Only the intended recipient can recover the plaintext from the ciphertext，and the recipient can verify the validity of the proxy signature.As compared to the existing schemes，the new scheme provides both forward security and public verifiability.What’s more，the new scheme is more convenient for application.

Key words: proxy-signcryption, identity based cryptography, forward secure, bilinear pairings, signcryption